SD3118-6R8-R Equivalent & Substitute Parts

Part Overview

The SD3118-6R8-R is a 6.8 µH shielded drum core wirewound inductor manufactured by Eaton - Electronics Division. This surface mount component is rated for 850 mA continuous current with a DC resistance of 232mOhm and operates across the temperature range of -40°C to 125°C. The part is RoHS compliant and currently active in production with 752 pieces available in inventory.

Substitute parts are identified when equivalent electrical performance can be achieved within the specified parameter tolerances while maintaining functional compatibility in the target application circuit.

Substiute Parts

SD3118-6R8-R

Eaton - Electronics DivisionIn Stock: 772SD3118-6R8-R Datasheet

Current PartRFQ

SRU3017-6R8Y

Bourns Inc.In Stock: 1479SRU3017-6R8Y Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the SD3118-6R8-R is determined by the following critical parameters:

Electrical Equivalence Criteria:

• Inductance value must be 6.8 µH within the ±30% tolerance band
• DC resistance must not exceed the original specification to prevent excessive power dissipation
• Current rating must meet or exceed 850 mA to support the intended load
• Core material must be ferrite to maintain electromagnetic performance characteristics
• Shielding configuration must be shielded to control electromagnetic interference

Mechanical & Environmental Criteria:

• Surface mount package configuration required
• Operating temperature range must encompass -40°C to 125°C
• RoHS compliance status must be active (RoHS Compliant or ROHS3 Compliant)
• Moisture sensitivity level must be MSL 1 or equivalent

The SRU3017-6R8Y from Bourns Inc. meets these substitution criteria with equivalent inductance, ferrite core construction, shielded configuration, and extended current rating capability.

Parameter Comparison

Engineering Selection Recommendations

Primary Selection: SD3118-6R8-R

The SD3118-6R8-R remains the primary component choice when available. This part is active in production, RoHS compliant, and maintains full inventory availability with 752 pieces in stock. The component meets all specified electrical and environmental requirements for the intended application.

Substitute Selection: SRU3017-6R8Y

The SRU3017-6R8Y from Bourns Inc. is qualified as a direct substitute when SD3118-6R8-R availability is constrained. This part demonstrates superior electrical performance with a current rating of 1 A (exceeding the 850 mA requirement) and significantly lower DC resistance of 85 mOhm compared to 232 mOhm. Both components maintain identical inductance values, ferrite core construction, shielded configuration, and operating temperature specifications.

Physical Considerations:

The SRU3017-6R8Y exhibits a slightly larger footprint (3.50mm x 3.30mm versus 3.10mm x 3.10mm) and increased height (2.00mm versus 1.80mm). PCB layout verification is required to confirm clearance compatibility in space-constrained applications.

Compliance Status:

Both components maintain active RoHS compliance status. The SRU3017-6R8Y carries ROHS3 certification, indicating compliance with the most current regulatory requirements. Both parts are MSL 1 rated with unlimited moisture sensitivity protection.

Frequently Asked Questions (FAQ)

Q: Can the SRU3017-6R8Y be used as a direct replacement for the SD3118-6R8-R?

A: Yes, the SRU3017-6R8Y qualifies as a direct electrical substitute. Both components provide 6.8 µH inductance with ±30% tolerance, ferrite core construction, and shielded configuration. The substitute part exceeds the current rating requirement and provides lower DC resistance. Physical dimensions differ slightly; PCB layout verification is necessary.

Q: What are the key electrical differences between these two inductors?

A: The primary electrical differences are current rating and DC resistance. The SRU3017-6R8Y is rated for 1 A continuous current versus 850 mA for the SD3118-6R8-R. The SRU3017-6R8Y exhibits 85 mOhm DC resistance compared to 232 mOhm, resulting in lower power dissipation and improved efficiency in the application circuit.

Q: Are there any package or mounting compatibility issues?

A: Both components are surface mount inductors with identical mounting type classification. The SRU3017-6R8Y has a slightly larger footprint and height. Verify PCB layout clearances and solder pad spacing to confirm compatibility with existing circuit board designs.

Q: Do both parts meet current environmental and compliance standards?

A: Yes. The SD3118-6R8-R is RoHS compliant. The SRU3017-6R8Y is ROHS3 compliant, representing the current regulatory standard. Both parts are MSL 1 rated and operate across -40°C to 125°C. Both are classified under ECCN EAR99 and HTSUS 8504.50.4000.

Q: What is the saturation current difference between these inductors?

A: The SD3118-6R8-R has a saturation current (Isat) of 1.12 A. The SRU3017-6R8Y has a saturation current of 530 mA. For applications operating near maximum current levels, the SD3118-6R8-R provides greater saturation margin.

Q: Which part should be selected for new designs?

A: For new designs, either part is acceptable based on availability and specific application requirements. If PCB space is constrained, the SD3118-6R8-R offers a smaller footprint. If lower power dissipation is prioritized, the SRU3017-6R8Y provides superior performance with its lower DC resistance.